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The phone you are rining is on your network? I know you mentioned PSTN line but I want to ask the question anyway.

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It doesn't matter, if the phone i am ringing is on my network or an external phone. When i call my mobile phone and hung up it is still ringing and ringing.

itfarmer said:

Does the person you call have this problem only with you or is it also with other calls?

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it happens only if i call with 3CX Phone System

itfarmer said:

There are two options:
- Call disconnect is not send through.
- on hook and off hook is not configured correctly

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Where can i change the settings for on hook and off hook???

If i use 3CX Phone directly connected with my VoIP provider it all works fine.
My problem with ringing after hung up appears only when i use 3CX Phone System.
I am sure that this problem didn't appear with the older version (2.0).
My VoIP-provider is "Arcor" from Germany.

It is clean IP Phones, so I not sure if there is any voltage settings ?
The link's for manuals are:
http://www.grandstream.com/user_manuals/GXP2000.pdf
http://www.grandstream.com/user_manuals/GXV3000_User_Manual.pdf

The reason this happens is because the Grandstream (gxw-4008 in my case) does not respond to the SIP BYE message sent by 3CX, and keeps on ringing.

For some reason 3CX does not send the Grandstream a CANCEL message, but does send other phones a CANCEL message. This may be correct as far as the SIP protocol goes, but it does result in the Grandstream phones continuing to ring.

Grandstream said they would change their firmware to stop ringing on BYE.

The problem does not happen with other IP PBX's such as Asterix and Axon, so maybe they break the SIP protocol to make sure this doesn't happen.

but the rfc guideline say 3xc have only to send a "CANCEL" if there was no response if there was any response there is no need for "CANCEL" If any Response came frome the other side like it indicate that it is ringing the option for end this SESSION is "BYE".
it would be a workaround for the mistakes of other people when 3cx would send both "CANCEL" & "BYE" to end the session.